Process of applying surface paper to corrugated packing-boards.



PATENTED JUNE 23, 1908.

W. H. LATUS.

PROCESS OF APPLYING SURFACE PAPER TO CORRUGATED PACKING BOARDS.

APPLICATION FILED APR. 11,190'7-.

INVENTEIR:

HIEA QRNEY WITNE'EIEIEEI:

I ITED STATES PATENT'OIPFICE.

WILLIAM H. LATUS, or NEW YORK, N. Y.

PROCESS OF APPLYINQ SURFACE PAPER TO CORRUGATED PAGKING-BQARDSi gated paper packing board it has been customary to a ply on one or both sides of the corrugated s ieet, flat or plane paper boards or sheets to give strength and rigidity to'the packingboard as a whole and to prevent the corrugationsin the board from being tened out in use and thereby destroying o r greatly reducing the efficiency of'the board for the purposes for which it was intended.

Heretofore it has been customary to secure the outer sheet or sheets to the corrugated sheet by pasting the sheets together by an adhesive that required the application of heat in order to dry the adhesive and cause the sheet to hold together, it re uiring in some instances about twenty-four iours for the adhesive to dry and the sheets to be prop erly connected. Where fiat sheets were em ployed on both sides of the corrugated sheet 1t was customary to'first paste one flat sheet on the corrugated sheet, .dry the composite sheet for, say, twenty-four hours, then run the composite sheet throu h the machine again applying the second at sheet to the opposite side of the corrugated sheetand then subject the board thus made to another drying process for, say, twenty-four hours. It has also been customary heretofore to make a so-called cork packing board by applyin an adhesive to one side of a flat paper oar cork to the 8.( hesive. The adhesive used, like that employed in making the corrugated board, required the application of heat to dry it and make the granulated cork adhere to the fiat paper board sheet. Both of these methods required much time and a great amount of space, drying room, drying racks, etc-., in manufacturing the packing boards.

The object of my invention is to overcome the above and other difliculties heretofore encountered in the manufacture of acking boards of the characters specified an to proand ap lying a layer of granulated- Specification of Letters Patent.

Application flled April 11, 1907. Serial No. 367,493.

Patented June 23, 1908.

duce an eflicient ackin board and to save much time and la or in t eproduction of the board.

To the above and other ends which will hereinafter apipear, my invention consists of the article an method hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a diagrammatic sectional view showing one form of machineon which corrugated aper board may be made in accordance wit my invention. Fig. 2 is a longitudinal sectional view of a fragment of one form of corrugated paper board made in accordance with my invention.

It should be understood that the board of my invention may be made on man differcarry out my invention rapidly and economically.

In making one character of board in accordance with my invention I employ any suitable stock such as that ordinarily em loyed for making com osite packing paper card, the sheet 1 to e corrugated being carried from a roll or reel 2 to hollow rolls 3 corrugated at 4 and heated by steam or otherwise. The sheet or web 1 in passing between the rolls 3 is corrugated as represented in Fi 2 and thence passes between the rolls 5 and 6. Each ofthese' rolls is heated by steam or otherwise and turns in a tank 7 containing an adhesive substance which will be uickly hardened when chilled. In practice l have found that tar answers the purposebut from the broad aspect of my inventlon do not restrict myself to the particular adhesive material employed so long as it is an adhesive that will uickly harden when chilled. The rolls 5 and 6 apply a coating of tar or other equivalent adhesive to the t1 s 8 of the corrugations as the corrugated s eet passes between the coating rolls 5 and 6. In case a plane or flat sheet is to be applied to only one side of the corrugated sheet then only one coating roll 5 or6 is em loyed; but Where a fiat sheet is to be ap lie to both sides of the corrugated sheet as s 1OWI1 in Fig. 2 then both ooatin rolls will be used; Eac of the rolls 5 and 6 is preferably hollow and is heated by steam or otherwise to maintain the tar or other adhesive in the tanks 7 sufiiciently soft to enable it to be carriedon the surface of the rolls and applied to the corrugated sheet at 8. The corrugated sheet passes from the coating rolls between rolls 9 and 10 which are preferably hollow and may bemaintained heated. Flat sheets '11 and 12 of paper board are carried from rollers or reels .13 and 14 respectively around the rolls 9 and 10 respectively and into contact with the coated corrugations on opposite sides of the sheet 1, sufficient pressure being applied by the rolls 9 and 10 to cause the sheets 11 and 12 to adhere to the corrugated sheet. If only one flat sheet is to be employed one of the sheets 11 or 12 will,

of course, be dis ensed with. The composite corrugated ac g board, made up of the corrugated s eets 1 and the sheets 11 and 12,

ass from the rolls 9 and 10 between fiat ollow latens 15 and 16 spaced a art at ad- -jacent at faces corres onding su stantiall and rendering it unnecessary to maintain extensive drying rooms, dry racks, etc.

In making so-called cork board in accordance with my invention a coating of tar or equivalent adhesive is a plied in the usual manner to the fiat paper board and the layer of granulated cork is applied to the adhesive whlch is then chilled to harden it and the board is immediately ready for use.

Various changes may be made in the board .andvarious changes may be employed in carrying out the method of manufacture Without de arting from my invention.

What I c aim as new and desire to secure by Letters Patent, is

The herein described process of a plying surface paper to corrugated packing cards,

which consists in coating the crowns or tips of the corrugations of the pa er boards with heated tar, applying the su ace paper in a continuous strip to the tar-coated crowns of" the corrugations, and passing the product between hollow SII10Otl11I1Qi ifilatens containing a-cooling medium to and set the tar.

Si ned at the borough of Manhattan, city of ew York, in the county of Kings, and

State of New York, this 8th day of April A. D. 1907.

WILLIAM H. LATUS.

Witnesses: CHARLES E. SMITH,

HENRY A. ROBERTS. 

